Don't know much about ACAD LT on MAC but looks to me like you've got cleanscreen active.
This is a key combo CTRL+0 (or type cleanscreen)
Does this help?
Or maybe you don't have a workspace selected, Search for the 'gear wheel' in the lower right bar.
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Kind regards,
Edwin Rense
Cadac Group AEC BV
Supporting Consultant AEC
Cadac Group .
